高灵敏度宽频带OPCM超声换能器的试制  

Manufacture of High Sensitivity and Broadband OPCM Ultrasonic Transducers

作　　者：赵国旗[1] 曾洪[1] 骆英[1] 王自平[1] 

机构地区：[1]江苏大学机械工业机械结构损伤检测评估技术重点实验室,江苏镇江212013

出　　处：《仪表技术与传感器》2011年第11期71-73,共3页Instrument Technique and Sensor

基　　金：国家高技术研究发展计划(863计划)项目(2009AA03Z107);国家自然科学基金项目(50875114);江苏省国际产学研合作项目(BZ2009042)

摘　　要：正交异性压电复合材料(Orthotropic Piezoelectric Composite Materials,OPCM)超声换能器因其特有的正交异性特征具有发射和接收定向波信号的能力,有助于提高结构损伤定位精度。在OPCM元件研究的基础上,理论分析了声阻抗匹配层与OPCM元件间的声阻抗关系,并通过实验验证了带声阻抗匹配层的OPCM换能器具有更高的正交比,灵敏度和带宽也进一步得到提高。Orthotropic piezoelectric composite materials（OPCM） ultrasonic transducers can improve the positioning accuracy of structural damaging test because of the orthotropic character with the ability of launching and receiving directional signal. Based on the study of OPCM components, the acoustic impedance relation of acoustical impedance matching layers and OPCM components were analyzed in theory. According to the experiment, the orthotropic character is more noticeable,the sensitivity and the bandwidth of the transducer with matching layer are higher and wider than the single OPCM transducer.

关 键 词：OPCM超声换能器 正交异性 声阻抗匹配层 灵敏度 相对带宽 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]